This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A094327 #11 Nov 10 2023 12:26:35
%S A094327 111111111,1001,100,21,14,13,12,11,10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%T A094327 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%U A094327 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9
%N A094327 a(n) = 9 written in base n.
%C A094327 The term 111....1111 should officially be called the "unary expansion", since in base 1 only the digit 0 may appear.
%H A094327 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A094327 G.f.: x*(111111111 - 111110110*x - 901*x^2 - 79*x^3 - 7*x^4 - x^5 - x^6 - x^7 - x^8 - x^9)/(1 - x). - _Stefano Spezia_, Nov 10 2023
%t A094327 Join[{111111111},Table[FromDigits[IntegerDigits[9,n]],{n,2,90}]] (* _Stefano Spezia_, Nov 10 2023 *)
%Y A094327 Cf. A001731, A063432, A035613, A094324, A094325, A094326, A094232, etc.
%K A094327 nonn,base,easy
%O A094327 1,1
%A A094327 _N. J. A. Sloane_, Jun 04 2004